docs: def cache(cls, id):
          """return the number of query cache for the last 24H"""
          sampler = {'unit': 'days', 'value': 1, 'function': 'sum'}
          query = 'webacc.requests.cache.all'
          metrics = Metric.query(id, 60 * 60 * 24, query, 'paas', sampler)
  
          cache = {'hit': 0, 'miss': 0, 'not': 0, 'pass': 0}
          for metric in metrics:
              what = metric['cache'].pop()
              for point in metric['points']:
                  value = point.get('value', 0)
                  cache[what] += value
          return cache